The SMC DA* 200 F2.8 comes fully sealed and lightweighted at 850g. It is very handy. the silent focus works at supreme level, it is reliable and quite fast. this is the only option to go for wildlife. mechanical focus systems are normally not usable for wildlife photography except in the ZOO or in commercial Parks. there the animals mostly turn away in a disgusted manner from any two legged individual or are simply bored of humans. In almost real situations only silent focus is doing its job ...